A Case Report on Citrobacter Koserii Causing Urinary Infection

The increased occurrence of urinary tract infections (UTIs) among older male patients, particularly in those with numerous comorbidities, has led to a greater awareness of these illnesses. The 76-year-old man patient in this case had a complex UTI brought on by the multidrug-resistant bacterium Citrobacter koserii, who also had underlying disorders. This case highlights the difficulties in diagnosing and treating UTIs in older men, especially those who have immunosuppressive diseases and incontinence. Despite being thought of as having low virulence, C. koserii has shown signs of growing resistance to antibiotics. Managing such infections requires prompt empirical treatment with broad-spectrum antibiotics such as piperacillin/tazobactam, with culture-guided de-escalation guaranteeing the best results. For elderly patients with complex UTIs brought on by multidrug-resistant organisms, early detection and focused antibiotic treatment are crucial. In order to avoid therapeutic failure, this instance highlights the significance of individualized empirical therapy and careful follow-up.